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0.0.4 • Public • Published

RxJS-CLI v0.0.3-pre

Custom builds makes it easy to create lightweight versions of the Reactive Extensions for JavaScript (RxJS). No need to worry about which files are required, just pick the operators you want and we'll handle the dpendencies for you! This way you can make RxJS as small as you wish, only taking the operators you wish to use! Note that this build system requires RxJS version 2.3.12+.


The Rx CLI should be installed globally to allow you to use the rx command.

Using npm:

{sudo} npm i -g rx-cli
rx -h


To get started, there are two main ways of specifying which operators you would like:

  • Methods option
  • File option

Method List

To specify which methods you wish to include, you can use the following command where you comma separate the operators using either the --methods option or -m shortcut.

rx -m select,selectmany,where,takeuntil,fromevent
rx --methods select,selectmany,where,takeuntil,fromevent

File Option

Instead of listing which files you would like, you could also use the file option using the --file option or -f shortcut. The file must look like the following example. We have provided an all.js file which includes all the methods that RxJS provides.

// methods.js
module.exports = {
  operators: [

Once the file has been defined, then you can use it to create your custom RxJS build:

rx -f methods.js
rx --file methods.js

Lite Builds

Another common feature is to have a lite build. This reduces some of the capabilities of RxJS, for example, removing Rx.Observer.checked as well as the CatchScheduler. Use this when you don't need this functionality.

rx -l -m select,selectmany,where,takeuntil,fromevent
rx --lite --methods select,selectmany,where,takeuntil,fromevent

Compatibility Builds

If you need to support older browsers, you'll want to use the compatibility option. This polyfills behavior to ensure that RxJS works on browsers I6+, Firefox 3+, etc.

rx -c -m select,selectmany,where,takeuntil,fromevent
rx --compat --methods select,selectmany,where,takeuntil,fromevent

Other Options

Other options are supported, such as:

  • --version - Displays the version number
  • -h, --help - Displays help information
  • -s, --silent - Skips status updates to the console


We're always looking for contributors, especially in the following areas:

  • SourceMaps
  • More fine grained operators


Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at


Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.



npm i rx-cli

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